Re: 1994 90hp evinrude
Use Champion spark plugs # QL77JC4 or QL82C The 82 is hotter and if you are fouling plugs at low speed, goes with that one. Stay away from NGK, as they do not perform well in OMC units. Gap at .030 unless you troll alot. If so, set them to .040 gap. Start off with the QL77JC4's first and see how it does..